268Administering volumes

Monitoring and controlling tasks

Any tasks started by the utilities invoked by vxrecover also inherit its task ID and task tag, so establishing a parent-child task relationship.

For more information about the utilities that support task tagging, see their respective manual pages.

Managing tasks with vxtask

Note: New tasks take time to be set up, and so may not be immediately available for use after a command is invoked. Any script that operates on tasks may need to poll for the existence of a new task.

You can use the vxtask command to administer operations on VxVM tasks that are running on the system. Operations include listing tasks, modifying the state of a task (pausing, resuming, aborting) and modifying the rate of progress of a task. For detailed information about how to use vxtask, refer to the vxtask(1M) manual page.

VxVM tasks represent long-term operations in progress on the system. Every task gives information on the time the operation started, the size and progress of the operation, and the state and rate of progress of the operation. The administrator can change the state of a task, giving coarse-grained control over the progress of the operation. For those operations that support it, the rate of progress of the task can be changed, giving more fine-grained control over the task.

vxtask operations

The vxtask command supports the following operations:

abort Causes the specified task to cease operation. In most cases, the operations “back out” as if an I/O error occurred, reversing what has been done so far to the largest extent possible.

list Lists tasks running on the system in one-line summaries. The -loption prints tasks in long format. The -hoption prints tasks hierarchically, with child tasks following the parent tasks. By default, all tasks running on the system are printed. If a taskid argument is supplied, the output is limited to those tasks whose taskid or task tag match taskid. The remaining arguments are used to filter tasks and limit the tasks actually listed.

monitor Prints information continuously about a task or group of tasks as task information changes. This allows you to track the progression of tasks. Specifying -lcauses a long listing to be printed. By default, short one-line listings are printed. In addition to printing task information when a task state changes, output is also